6,407,900
2.5368 already has 5 significant digits.
The first 3 significant digits of a number are the first 3 digits starting from the left ignoring any leading zeros. So 31456 = 31500 (3 significant digits) The 5 in the "56" rounds the 4 up.
There are 5 significant digits in 18.0140.
To round numbers to the correct number of significant figures, start by identifying the last significant figure you want to keep. Then, look at the next digit - if it is 5 or greater, round up; if it is less than 5, round down. Finally, adjust the rest of the digits to the right of the last significant figure to zeros.
5 significant digits because the 2 zeros are in between other significant digits.
To round to 3 significant digits, start counting from the first non-zero digit. If the digit to the right of the third significant digit is 5 or greater, round up. If the digit is less than 5, leave the third significant digit unchanged. Replace all digits to the right of the third significant digit with zeros.
All of the digits are significant digits in this case. A zero between other (non-zero) digits is considered significant.
To round the number 1127436092 to four significant figures, identify the first four significant digits, which are 1127. The next digit is 4, which is less than 5, so you do not round up. Therefore, the number rounded to four significant figures is 1127000000.
All the digits are significant, so there are 5 significant digits.
There are 2 significant digits: 5 and 4
281000, or 2.81 x 10^5.
You have to round to two significant digits because 5.5 only has two. So, 5.5 × 2.141 = 12